// webpack的配置文件（项目打包时做一些配置）
'use strict' // 开启严格模式

// CommonJs导包规范
// - 导出    module.exports   || exports
// - 导入   require('模块名')
const path = require('path')
const defaultSettings = require('./src/settings.js')

// 将传入的相对路径变成绝对路径
function resolve(dir) {
  return path.join(__dirname, dir)
}

// 设置网页的标题
const name = defaultSettings.title || 'vue Admin Template' // page title

// 设置 项目启动端口号
const port = process.env.port || process.env.npm_config_port || 9528 // dev port

// 脚手架相关的配置 https://cli.vuejs.org/config/
module.exports = {

  publicPath: '/', // 打包导出的资源在什么环境下运行  '/' 在服务器的的环境下运行  ||  './' 在任何环境下运行
  outputDir: 'dist', // 设置打包导出资源目录的名字
  assetsDir: 'static', // 设置打包导出目录静态目录的名字  dist/static   放 img  css  fonts
  lintOnSave: process.env.NODE_ENV === 'development', // 是否开启eslint
  productionSourceMap: false, // 是否开启map映射
  // 热更新的服务器
  devServer: {
    port: port, // 配置端口号
    open: true, // 是否自动打开浏览器
    // 设置错误是否在浏览器显示
    overlay: {
      warnings: false,
      errors: true
    },
    proxy: {
      '/api': {
        target: 'http://192.168.103.48:3000'
      }
    }
  },
  // webpack的【对象配置】
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  // webpack的【函数配置】
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // only package third parties that are initially dependent
                },
                elementUI: {
                  name: 'chunk-elementUI', // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'), // can customize your rules
                  minChunks: 3, //  minimum common number
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
          config.optimization.runtimeChunk('single')
        }
      )
  }
}
